need help

my moon roof only opens about an inch or two. What can i do to fix it? it owrk fine then all of a sudden it stopped and i just want it ixed. I was told there is a a panel you open to get to fix it but i cna't find it. i on a special edition cougar and its factory installed if you now where i can find a book or even know how to ix it please tell me i'mgoing crazy trying to fix it. the dealership said they won't even touch it.